RasterImagePainter CreateLeadDC method modifies image dpi. - age) changes dpi of the rasterImage to 150dpi

using (var codecs = new RasterCodecs())
{
   codecs.Options.Load.XResolution = 300;
   codecs.Options.Load.YResolution = 300;

   using (RasterImage image = codecs.Load(@"C:\Users\Public\Documents\LEADTOOLS Images\barcode1.tif"))
   {
      IntPtr ptrGraph = RasterImagePainter.CreateLeadDC(image);
      Graphics graph = Graphics.FromHdc(ptrGraph);

      float fontSize = 8.0F * image.XResolution / 72.0F;
      var labelFont = new Font("Courier New", fontSize, FontStyle.Bold);
      var brush = new SolidBrush(Color.Black);
       
      graph.DrawString("Test", labelFont, brush, new Point(200, (int)(image.XResolution * .05) + 5));

      codecs.Save(image, @"C:\Users\Public\Documents\LEADTOOLS Images\test.tif", RasterImageFormat.Tif, 0);
   }
}

 internal void StampPage(RasterImage pImage, bool pTopOfPage, int pPage, int pPageCount)
        {
            int imageDPI = 300;
            pImage.XResolution = imageDPI;
            pImage.YResolution = imageDPI;

            //int imageDPI = Convert.ToInt32(pImage.Width / 8.5);
            float yAdj = pTopOfPage ? 0 : pImage.Height - imageDPI / 2; // document height - 1/2"
            //float YAdj = (float)(pTopOfPage ? 0 : pImage.Height - pImage.YResolution / 2);

            int labelX = pImage.Width - imageDPI * 5; // Width - 5" => 3.5" in pixels

            try
            {
                // At this point pImage.Xresolution = 300
                IntPtr ptrGraph = RasterImagePainter.CreateLeadDC(pImage);
                // At this point pImage.Xresolution = 150
                Graphics graph = Graphics.FromHdc(ptrGraph);
                //float fRatioCorrection = pImage.XResolution / graph.DpiX;

                pImage.XResolution = imageDPI;
                pImage.YResolution = imageDPI;

                // Therefore, we need to calculate the font size in pixels based on the DPI of the scanned image
                // Explicit set font size to 8pt => 8 * image dpi / 72 pt/in = 33.333 
                float fontSize = 8.0F * imageDPI / 72.0F;
                var labelFont = new Font("Courier New", fontSize, FontStyle.Bold);

                var whiteBrush = new SolidBrush(Color.White);
                var brush = new SolidBrush(Color.Black);
                string labelText = "           Page " + pPage + " of " + pPageCount + " Sequence No. "
                                   + Program.currentDocument.SequenceNo;
                //White Background
                graph.DrawRectangle(new Pen(whiteBrush), labelX      // Page width - 5" => 3.5" in pixels
                                   , 19 + (yAdj * imageDPI)          // 19/300 ~ 1/16" + (either 0" if top of page or total nonsense if bottom of page)
                                   , pImage.Width - labelX           // Page width minus left offset
                                   , (int)(imageDPI * .125 + yAdj)); // 1/8" + (either 0" if top of page or 10.5" if bottom of page)
                graph.FillRectangle(whiteBrush, labelX
                                   , 19 + (yAdj * imageDPI)
                                   , pImage.Width - labelX
                                   , (int)(imageDPI * .125 + yAdj)); // Note 1/8" = 37.5 pixels vs Font size of 33.334 pixels

                graph.DrawString(labelText, labelFont, brush
                                , new Point(labelX + 2  // Two pixel inside of white label
                                           , (int)(imageDPI * .05 + yAdj - 2))); // Two pixel from bottom of white label
                                                                                 //graph.DrawString(strLabel, labelFont, brush
                                                                                 //                , new Point(intLabelX
                                                                                 //                           , (int)(pImage.YResolution * .05 + YAdj)));

                RasterImagePainter.DeleteLeadDC(ptrGraph);
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }